Carriage-cross-feed stop mechanism for lathes.



E. R. SEWARD.

CARRIAGE "E R OSS FEED STOP MECHANISM FOR LATHES.

APPLICATION FILED JULY 23, 1915.

Patented J an. 18, 1916.

3 SHEETS-SHEET l.

E. B. SEWARD. CARRIAGE CROSS FEED STOP MECHANISM FOR LATHES. APPLICATION FILED JULY 28. 1915.

1,168,683,, Patented Jan. 18, 1916.

3 SHEETS-SHEET 2.

W' 29115 lnveniar" 6M2 w mi fifiys E. R. SEWARD.

CARRIAGE CROSS FEED STOP MECHANISM FOR LATHES.

APPLICATION FILED IULY128, 1915. v

1, 168,683, Patented Jan. 18, 1916.

3 SHEETS-SHEET 3.

THE COLUMBIA PLmyIOGRAPfl cc" WASHINGTON. D. c.

rare rrir orrion.

ERNEST It. SEWAR-D, 0F MADISON, \R IECONSIN, ASSIGNOR T0 GISHOLT MACHINE COMPANY, OF MADISON, WISCONSIN, A CORPORATION OF WISCONSIN.

CARRIAGE-CROSS-FEED STOP MECHANISM FOR LATHES.

Lies-.683.

To all whom it may concern:

Be it known that I, ERNEST R. SEWARD, a citizen of the United States, residing at Madison, in the county of Dane and State of lVisconsin, have invented certain new and useful Improvements in Carriage-()ross- Feed Stop Mechanisms for Lathes, of which the following is a specification.

This invention relates to improvements in lathes of that type employing a carriage cross-feed having'both manual and power cross-feed mechanisms; and the principal object of the invention is to provide a new and improved automatic mechanismfor arresting the power feed at predetermined points governed by the tools used in the faces of the tool post and the operations to be performed thereby.

In a simple form the invention is applicable to a carriage cross-slide carrying a tool post having a single face; but the principal advantage and utility of the invention is in connection with carriage cross-slides carrying tool posts having a plurality of faces.

Other minor objects and advantages of the invention will be apparent from the following detailed description when considered in connection with the accompanying drawings wherein I have illustrated one practical embodiment of the invention, and in which Figure l is a front elevation, with parts appearing broken out and in section, of the carriage slide and its apron, the cross slide and tool post mounted thereon, and external parts of my improved stop mechanism; Fig. is a view of the parts shown in Fig. 1 as seen from the right of the latter figure, the tool post appearmg in elevation and the underlying parts in vertical section on the line 22 of Fig. 1; Fig. 3 is a horizontal section on the line 3-3 of Fig. 2; Fig. i is a top plan view of certain parts of the automatic stop mechanism, looking, downwardly on the line t-4 of Fig. 1; Fig. 5 is an enlarged detail view, partly in section on the line 5+5 of Fig. 1; Figs. 6 and 7 are detail views illustrating parts of a manually operable clutch shifting device and means for.

locking the clutch in either of two working positions or in neutral position.

Referring to the drawings, 1 designates a portion of. the lathe-bed on which are formed the usual inverted V-ways 2, and 3 designates the carriage slide mounted on the ways 2 and'carrying the cross slide 4, this Specification of Letters Patent.

Application filed July 28, 1915.

Patented Jan. 18, 1am.

Serial No. 42,328.

latter in turn having mounted thereon the usual tool post 5.

6 designates the carriage apron bolted to V l4, just inwardly of the hand wheel 17 is a bracket 18 carrying a flat bar 19 which is held from endwise movement by a set screw 20. When it is desired to feed the tool post .5 in or out by hand, the hand-wheel 17 is revolved in either direction, and the rotation of nut 12 on the non-revolving screw 10 imparts the desired motion to the tool post 5.

Referring now to the power feed mecha' nism, engaging with the wide pinion 16 is an idler gear 21 loosely mounted in the apron on a stud 22 and driven by a pinion 28 secured to or formed on the inner end of a long externally threaded Loosely mounted on'the hub of pinion 23 is a gear 25 that has a friction clutch connection to the sleeve 2% by means of friction ring 26 on the gear 25, a friction ring27 splined to the sleeve 24.- and an interposed split friction ring 28 that'is adapted tobe. expanded to clutch the rings 26 and 27 together by means of a tapered pin 29 mount; ed in the member 27 and forced outwardly by a rod 30 slidably mounted in the sleeve 24 and having a camend 31 engaging the inner cam end 32 of the pin 29. By the means last described the gear 25 is normally locked to the sleeve 24: carrying the pinion 23. Gear 25 is driven from a pinion 33 fixedly secured on the hub of a bevelgear 34:, which, latter, as best shown in Fig. 3, is rotated from a power driven shaft 35 through a double faced clutch 36 splined on shaft '35 and adapted to be coupled to either of a pair of oppositely facing bevel pinions 37 and 38 both loosely mounted on shaft 35 and meshingwith pinion 34. Since the shaft 35 runs constantly in one direction, motion in'either direction is imparted through the described gear train to the cross feed nut 12, depending upon the direction in which the clutch sleeve 24 a 36 is shifted.- This clutch 36 is manually controlled by the operator through a handle sleeve 39 that is slidably but non-rotataoiy mounted by means of a key so and slot ii on a shaft -l-2 that carries at its inner end an eccentric pin as engaging the annular groove 36 of the clutch 36. The shaft a9 is mounted in a sleeve 44, which latter in turn is non-rotatably mounted, by means of a set screw 4.5, Fig. 2, in the hub of a supporting bracket l6 that is pivotally supported so as to be capable of oscillation on the power driven shaft 35. The handle sleeve 39 is formed with two diametrically opposite square teeth e7 that are adapted to engage either of two pairs of notches 4L8 and 49 formed ninety (90) degrees apart in the outer end of sleeve 4%. The handle sleeve 39 is normally urged inwardly by a coil spring 50 abutting at one end against the bottom of a socket 51 formed in the handle sleeve and at its outer end against a nut 52 on the outer end of the shaft 42. It will thus be seen that by pulling out the handle sleeve 39 and giving it a quarter turn from neutral position represented bythe notches 49, either of the two reversed feeds can be obtained. If it is not desired to operate the power feed, the handle sleeve can be engaged with the notches 49 which throws the clutch 36 to intermediate or neutral position. On the outer end of the pivoted bracket a6 is a laterally projecting lug 53 in which is mounted a catch block 54 that cooperates with another catch block, hereinafter described, to normally hold the bracket 46 in elevated position and with the separable gears 33 and 25 in mesh with each other.

55 designates a bonnet that is bolted to the apron 6, and carries the power feed mechanism, and pivoted on a stud 56 projecting from said bonnet is a bell crank lever, the substantially horizontal arm 57 of which 'is of considerable width, as shown inFig. 4c, and has on its opposite sides upstanding walls or flanges 58 in which are journaled several threaded rods 59 (four as 7 herein shown), on which rods are mounted a corresponding number of trip blocks 60, respectively. These trip blocks are adjustable lengthwise of their respective rods by screw heads 61 on the outer ends of said rods. The depending arm 62 of said lever carries a catch block 63 forming an element of the catch mechanism that supports the bracket 46 and directly cooperating with the catch block 54. The arm 57 is normally maintained elevated and the catch blocks 5% and 63 are normally maintained in engagement with each other by means of a spring-pressed pin 64 that engages the outer side of the lower end of the lever arm 62.

The bonnet 55 is formed with a hollow hub 65 that, as shown in Fig. 1, has a wide longitudinal slot 66 in its lower side. Fitted into the outer end of the hub 65 is a bearing block 67 that supports the outer end of the threaded hollow shaft or sleeve 24:; and threaded into the outer end of said sleeve 24. is a screw 68 by which the clutch locking rod 30 is actuated endwise by a screw driver applied to the outer end of screw 68. Mounted on the hub 65 is a sleeve 69 having in its lower side a relatively narrow longitudinal slot 70. Mounted on the threaded sleeve 24: is a traveler nut 71, to the lower side of which is secured a trip dog 72 that projects through both the slots 66 and 7 O and is traversed lengthwise of the threaded sleeve 24 by the rotation of the latter, the traveler nut and dog being confined against rotation by the sides of the slot 70. The trip dog 72 is designed to cooperate with any one of the four trip blocks 60 to eifect the release of the catch mechanism, depending upon the angular position of the sleeve 69 relatively to its supporting hub 65. Adjustment of said sleeve 69 is eifected by the means shown in Figs. 1 and 5, and consists of a spring-pressed plunger 73 mounted in a lateral lug 74 carried by the sleeve 69, said plunger cooperating with any one of a series of holes 7 5 formed in a stationary segment plate 7 6 rigid with the bonnet 55. When the spring plunger 73 is engaged with the upper hole 75, the. trip dog 72 will be swung laterally to a position wherein it will not engage any of the adjustable trip blocks 60; but when said plunger is engaged with any one of the other four holes 75, the trip dog 72 will engage with one of the trip blocks 60 and trip the feed at a point determined by the operator when he adjusts the screws 59. In the in stance shown four adjustable screws 59 are provided to correspond with four faces of the tool post 5, and when the tool post is manually operated to bring one of the four faces into proper relation with the chuck, the operator also manually sets the sleeve 69 by pulling out the spring plunger and engaging it in the location corresponding to the selected tool post face. 77 designates a collar secured on the outer end of threaded sleeve 2% confining the latter against endwise movement inwardly.

It may here be noted that the friction clutch 26, 27 and 28 serves merely as a safety device to prevent, through slippage, breakage of parts from any abnormal strain that may be brought to bear on parts driven through the described power feed.

'From the foregoing description it will be seen that when it is desired to engage the arm 62 outwardly, draws the catch block 63.

out of supporting engagement with catch block 54-, and allows the handle 39and the oscillating frame l6 to drop, as indicated by dotted lines in Fig. 2, thus disengaging gear 23 from gear and arresting the power feed. It may here be noted that the pitch of the thread on sleeve shaft 24 is much finer than the pitch of the thread on feed screw 10, being preferably approximately one-fourth the pitch of the latterso that while the cross slide is traveling say twelve inches the trip dog 72 will travel only four inches. Of course, any desired ratio of the pitchesof the two screws may be employed as desired. It may further be noted that as the nut 71 always travels in the same direction as the cross slide, and the trip blocks 60 are beveled on both sides, the said nut Will. trip the feed when the cross slide is feeding out from the center of the machine as well as when feeding in toward the center.

To those skilled in the art it will be apparent that the mechanism herein illustrated and described for performing the functions and accomplishing the purposes 1 of the invention may be variously modified in matters of detail without involving any change of principle, and hence I reserve all such variations and modifications as fairly fall within the terms and spirit of the appended claims.

I claim:

1. In a lathe, the combination of a cross slide, a screw feed therefor, a driven shaft, a gear train, including a pair of separable gears, intermediate said shaft and screw feed, a catch mechanism normally holding said separable gears in mesh, and a trip mechanism for releasing said catch mechanism and including an adjustable trip block,

a trip dog cooperating with said trip block to release said catch mechanism, and mechanism for causing said trip dog to travel to ward said trip block at a reduced speed relatively to the speed of said cross slide screw feed.

2. In a lathe, the combination of a. cross slide, a screw feed therefor, a driven shaft, a gear train, including a pair of separable gears, intermediate said shaft and screw feed, a catch mechanism normally holding said separable gears in mesh, and a trip mechanism for releasing said catch mechanism and including an adjustable trip block, a revolving threaded shaft driven by a mem-- ber of said gear train, a traveler nut on said threaded shaft, means holdmg said nut block to release said catch mechanism. 7

8. In a lathe, the combination of a cross slide, a screw feed therefor, a driven shaft, a.

gear train, including a pair of separable gears, intermediate said shaft and screw feed, a pivoted bracket carrying one of said separable gears, a catch member carried by Said bracket, a lever, one arm of which carries a cotiperating catch member serving to hold said bracket raised and said separable gears in mesh, an adjustable trip block carried by the other arm of said lever, a trip dog cooperating with said trip block to rock said lever and separate said catch members, and mechanism for causing said trip dog to travel toward said trip block at a speed bearing a. fixed ratio to the speed of said cross slide screw feed.

a. In a lathe, the combination of a cross slide, a screw feed therefor, a driven shaft, a gear train, including a pair of separable gears, intermediate said shaft and screw feed, a pivoted bracket carrying one of said separable gears, a catch member carried by said bracket, a lever, one arm ofwbich carries a cooperating catch member serving to hold said bracket raised and said separable gears in mesh, an adjustable trip block. carried by the other arm of said lever, a revolving threaded shaft driven by member of said gear train, a traveler nut on said threaded shaft, means holding said nut against rotation, and a trip dog carried by said nut and cooperating with said trip block to rock said lever and separate said catch members.

5. In a lathe, the combination of a cross slide, a screw feed therefor, a driven shaft, a

gear train, including a pair of separable gears, intermediate said shaft and screw feed, a catch mechanism normally holding said separable gears in mesh, and trip mech* anism for releasing said catch mechanism and including a plurality of independently adjustable trip blocks, a trip dog, and selective means for causing said dog to engage any one of said blocks whereby to release said catch mechanism.

6. In a lathe, the combination of a cross slide, a screw feed therefor, a driven shaft, a gear train, including a pair of separable gears, intermediate said shaft and screw feed, a catch mechanism normally holding said separable gears in mesh, and trip mechanism for releasing said catch mechanism and including a plurality of independently adjustable trip blocks arranged side by side, a trip dog, means for shifting said dog laterally into line with any one of said blocks,

and means for effecting a travel of said dog toward said block at a speed bearing a fixed ratio to the speed of said cross slide screw feed. 7

7. In a lathe, the combination of a cross slide, a screw feed therefor, a driven shaft, a gear train, including a pair of separable gears, intermediate said shaft and screw feed, a pivoted bracket carrying one of said i separable gears, a catch member carried by said bracket, a lever, one arm of which carries a cooperating catch member serving to hold said bracket raised and saidcseparable gears in mesh, a plurality of independently adjustable trip blocks mounted side by side on the other arm of said lever, a trip dog, means for shifting said dog laterally into line with any one of said blocks, and means for effecting a travel of said dog toward said block at a speed bearing a fixed ratio to the speed of said cross slide screw feed.

8. In a lathe, the combination of a cross slide, a screw feed therefor, a driven shaft, a gear train,'including a pair of separable gears, intermediate said shaft .and screw feed, a catch mechanism normally holding said separable gears in mesh, and a trip mechanism for releasing said catch mechanism and including a plurality of independently adjustable trip blocks arranged side by side, a revolving threaded shaft driven by a member of said gear train, a traveler nut on said threaded shaft, means for holding said nut against rotation, a trip dog carried by said nut, and means for shifting said dog laterally into line with any selected trip block.

Copies of this patent may be obtained for In a lathe, the combination of a cross slide, a screw feed therefor, a driven shaft, a

gear train, including a pair of separable gears, intermediate said shaft and screw feed, a pivoted bracket carrying one of said separable gears, a catch member carried by said bracket, a lever, one arm of which carries a cooperating catch member serving to hold said bracket raised and said separable gears in mesh, a plurality of independently adjustable trip blocks mounted side by side on the other arm of said lever, a revolving threaded shaft driven by a member of said gear train, a traveler nut on said threaded shaft, means for confining said nut against rotation, a trip dog carried by said nut, and means for shifting said dog laterally into line with any selected trip block.

10. In a lathe, the combination of a cross slide, a screw feed therefor, a power driven shaft, a reversible gear train, including a pair of separable gears, intermediate said shaft and screw feed, a pivoted bracket carrying one of said separable gears, a catch mechanism normally maintaining said bracket raised and said separable gears in mesh, a trip mechanism for releasing said catch mechanism operating in timed relation to the travel of said cross slide, a handle on said bracket for manually restoring the continuity of said gear train and reengaging the parts of said catch mechanism, and direction-reversing mechanism for said gear train associated with and operated by said handle.

ERNEST R. SEVVARD.

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

